FOSSBilling is a free, open-source billing and client management system. In versions 0.5.6 through 0.7.2, when a "ClientPasswordReset" record already exists for a client (from a previous unexpired reset request), subsequent calls to the "reset_password" guest API endpoint reuse the existing token instead of generating a new one. The 15-minute validity window is anchored to the first request's "created_at" timestamp, not the time of the most recent email. An attacker who obtained the original reset link remains able to use it even after the victim requests a new reset, because the original token is never invalidated or rotated. Version 0.8.0 patches the issue. Some workarounds are available. Configure a reverse proxy (e.g., Nginx, Apache, Cloudflare) to apply per-IP rate limiting to the "/client/reset-password" endpoint to minimize the window of opportunity, and/or manually clear expired "client_password_reset" records from the database after a client reports a suspected compromise.